Here make your way to the North-eastern part of Mt. Bur-Omisace. Enter the HolyCircle [screen 2] and talk to Anastasis.

Now go to Stilshrine of Miriam - south from Paramina Rift. It's time to acquire next esper - Mateus. Before leaving the Bur-Omisace I recommend buying the Storm Spear. It'll surely come in handy during the fight with Mateus.